Let's just compare previous gearsets to the current situation, our best guess is that the DoH AF gear will come from red scrips, much like the DoW/DoM specific AF sets came from mythology way back in 2.0. It will either follow the paradigm of those sets and the adept set, and not be meldable, in which case you can expect a single piece to be slightly below or equal to a fully melded chimeric felt item (think back to overmelded rose gold and vanya pieces being slightly better or equal to your AF2 gear). The alternative is that they are crafted much like class specific gear was in 2.0, perhaps gated behind a mastercraft 4 book from red scrips, or time gated materials much like sealant was for the forager pieces except once again, bought with red scrips.

In BOTH of these scenarios, you can expect the chimerical overmelded set to last you into a next tier, it would be a complete 180 for square to make the CRFT/CON caps so massive as to require a full set of the new AF gear.